<?php

class Smtp{

    /* Public Variables */

	var $smtp_port;

	var $time_out;

	var $host_name;

	var $log_file;

	var $relay_host;

	var $debug;

	var $auth;

	var $user;

	var $pass;

	/* Private Variables */
	var $sock;

	/* Constractor */

	function smtp($relay_host = "", $smtp_port = 25, $auth = false, $user, $pass) {
		$this->debug = false;

		$this->smtp_port = $smtp_port;

		$this->relay_host = $relay_host;

		$this->time_out = 30; //is used in fsockopen()

		$this->auth = $auth; //auth

		$this->user = $user;

		$this->pass = $pass;

		$this->host_name = "localhost"; //is used in HELO command
		$this->log_file = "";

		$this->sock = false;
	}

	/* Main Function */

	function sendmail($to, $from, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = "") {
		$mail_from = $this->get_address($this->strip_comment($from));

		$body = ereg_replace("(^|(\r\n))(\.)", "\1.\3", $body);

		$header .= "MIME-Version:1.0\r\n";

		if ($mailtype == "HTML") {
			$header .= "Content-Type:text/html\r\n";
		}

		$header .= "To: " . $to . "\r\n";

		if ($cc != "") {
			$header .= "Cc: " . $cc . "\r\n";
		}

		$header .= "From: $from<" . $from . ">\r\n";

		$header .= "Subject: " . $subject . "\r\n";

		$header .= $additional_headers;

		$header .= "Date: " . date("r") . "\r\n";

		$header .= "X-Mailer:By Redhat (PHP/" . phpversion() . ")\r\n";

		list ($msec, $sec) = explode(" ", microtime());

		$header .= "Message-ID: <" . date("YmdHis", $sec) . "." . ($msec * 1000000) . "." . $mail_from . ">\r\n";

		$TO = explode(",", $this->strip_comment($to));

		if ($cc != "") {
			$TO = array_merge($TO, explode(",", $this->strip_comment($cc)));
		}

		if ($bcc != "") {
			$TO = array_merge($TO, explode(",", $this->strip_comment($bcc)));
		}

		$sent = true;

		foreach ($TO as $rcpt_to) {
			$rcpt_to = $this->get_address($rcpt_to);

			if (!$this->smtp_sockopen($rcpt_to)) {
				$this->log_write("Error: Cannot send email to " . $rcpt_to . "\n");

				$sent = false;

				continue;
			}

			if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)) {
				$this->log_write("E-mail has been sent to <" . $rcpt_to . ">\n");
			} else {
				$this->log_write("Error: Cannot send email to <" . $rcpt_to . ">\n");

				$sent = false;
			}

			fclose($this->sock);

			$this->log_write("Disconnected from remote host\n");
		}

		return $sent;
	}

	/* Private Functions */

	function smtp_send($helo, $from, $to, $header, $body = "") {
		if (!$this->smtp_putcmd("HELO", $helo)) {
			return $this->smtp_error("sending HELO command");
		}
		// auth
		if ($this->auth) {
			if (!$this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user))) {
				return $this->smtp_error("sending HELO command");
			}

			if (!$this->smtp_putcmd("", base64_encode($this->pass))) {
				return $this->smtp_error("sending HELO command");
			}
		}

		if (!$this->smtp_putcmd("MAIL", "FROM:<" . $from . ">")) {
			return $this->smtp_error("sending MAIL FROM command");
		}

		if (!$this->smtp_putcmd("RCPT", "TO:<" . $to . ">")) {
			return $this->smtp_error("sending RCPT TO command");
		}

		if (!$this->smtp_putcmd("DATA")) {
			return $this->smtp_error("sending DATA command");
		}

		if (!$this->smtp_message($header, $body)) {
			return $this->smtp_error("sending message");
		}

		if (!$this->smtp_eom()) {
			return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]");
		}

		if (!$this->smtp_putcmd("QUIT")) {
			return $this->smtp_error("sending QUIT command");
		}

		return true;
	}

	function smtp_sockopen($address) {
		if ($this->relay_host == "") {
			return $this->smtp_sockopen_mx($address);
		} else {
			return $this->smtp_sockopen_relay();
		}
	}

	function smtp_sockopen_relay() {
		$this->log_write("Trying to " . $this->relay_host . ":" . $this->smtp_port . "\n");

		$this->sock = @ fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out);

		if (!($this->sock && $this->smtp_ok())) {
			$this->log_write("Error: Cannot connenct to relay host " . $this->relay_host . "\n");

			$this->log_write("Error: " . $errstr . " (" . $errno . ")\n");

			return false;
		}

		$this->log_write("Connected to relay host " . $this->relay_host . "\n");

		return true;
		;
	}

	function smtp_sockopen_mx($address) {
		$domain = ereg_replace("^.+@([^@]+)$", "\1", $address);

		if (!@ getmxrr($domain, $MXHOSTS)) {
			$this->log_write("Error: Cannot resolve MX \"" . $domain . "\"\n");

			return false;
		}

		foreach ($MXHOSTS as $host) {
			$this->log_write("Trying to " . $host . ":" . $this->smtp_port . "\n");

			$this->sock = @ fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out);

			if (!($this->sock && $this->smtp_ok())) {
				$this->log_write("Warning: Cannot connect to mx host " . $host . "\n");

				$this->log_write("Error: " . $errstr . " (" . $errno . ")\n");

				continue;
			}

			$this->log_write("Connected to mx host " . $host . "\n");

			return true;
		}

		$this->log_write("Error: Cannot connect to any mx hosts (" . implode(", ", $MXHOSTS) . ")\n");

		return false;
	}

	function smtp_message($header, $body) {
		fputs($this->sock, $header . "\r\n" . $body);

		$this->smtp_debug("> " . str_replace("\r\n", "\n" . "> ", $header . "\n> " . $body . "\n> "));

		return true;
	}

	function smtp_eom() {
		fputs($this->sock, "\r\n.\r\n");

		$this->smtp_debug(". [EOM]\n");

		return $this->smtp_ok();
	}

	function smtp_ok() {
		$response = str_replace("\r\n", "", fgets($this->sock, 512));

		$this->smtp_debug($response . "\n");

		if (!ereg("^[23]", $response)) {
			fputs($this->sock, "QUIT\r\n");

			fgets($this->sock, 512);

			$this->log_write("Error: Remote host returned \"" . $response . "\"\n");

			return false;
		}

		return true;
	}

	function smtp_putcmd($cmd, $arg = "") {
		if ($arg != "") {
			if ($cmd == "")
				$cmd = $arg;

			else
				$cmd = $cmd . " " . $arg;
		}

		fputs($this->sock, $cmd . "\r\n");

		$this->smtp_debug("> " . $cmd . "\n");

		return $this->smtp_ok();
	}

	function smtp_error($string) {
		$this->log_write("Error: Error occurred while " . $string . ".\n");

		return false;
	}

	function log_write($message) {
		$this->smtp_debug($message);

		if ($this->log_file == "") {
			return true;
		}

		$message = date("M d H:i:s ") . get_current_user() . "[" . getmypid() . "]: " . $message;

		if (!@ file_exists($this->log_file) || !($fp = @ fopen($this->log_file, "a"))) {
			$this->smtp_debug("Warning: Cannot open log file \"" . $this->log_file . "\"\n");

			return false;
			;
		}

		flock($fp, LOCK_EX);

		fputs($fp, $message);

		fclose($fp);

		return true;
	}

	function strip_comment($address) {
		$comment = "\([^()]*\)";

		while (ereg($comment, $address)) {
			$address = ereg_replace($comment, "", $address);
		}

		return $address;
	}

	function get_address($address) {
		$address = ereg_replace("([ \t\r\n])+", "", $address);

		$address = ereg_replace("^.*<(.+)>.*$", "\1", $address);

		return $address;
	}

	function smtp_debug($message) {
		if ($this->debug) {
			echo $message . "
			;";
		}
	}
}
?>